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Commitments and Contingencies (Legal, Letters of Credit, Bonds, Self-Insurance) (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended
Apr. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Commitments and Contingencies [Line Items]      
Letters of credit issued   $ 130.7 $ 128.4
Self-Insurance [Member] | Workers' Compensation, General and Automobile Policies [Member]      
Commitments and Contingencies [Line Items]      
Self-insurance reserve   112.8 108.9
Self-Insurance [Member] | Workers' Compensation, General and Automobile Policies [Member] | Other Long-Term Liabilities [Member]      
Commitments and Contingencies [Line Items]      
Self-insurance reserve, non-current   73.1 70.8
Self-Insurance [Member] | Workers' Compensation, General and Automobile Policies [Member] | Other Long-Term Assets [Member] | Cash [Member]      
Commitments and Contingencies [Line Items]      
Cash collateral held by insurance carriers   1.6 1.6
Self-Insurance [Member] | Employee Group Medical Claims Policies [Member]      
Commitments and Contingencies [Line Items]      
Self-insurance reserve   3.1 2.9
Performance and Payment Bonds [Member]      
Commitments and Contingencies [Line Items]      
Bonded projects, estimated costs to complete   61.3 53.0
Performance and Payment Bonds [Member] | Subsidiaries [Member]      
Commitments and Contingencies [Line Items]      
Outstanding bonds, amount   233.1 123.6
Financial Guarantees [Member] | Self-Insurance [Member] | Workers' Compensation, General and Automobile Policies [Member]      
Commitments and Contingencies [Line Items]      
Letters of credit issued   67.6 67.6
Surety Bonds [Member] | Self-Insurance [Member] | Workers' Compensation [Member]      
Commitments and Contingencies [Line Items]      
Outstanding bonds, amount   $ 34.8 $ 34.8
Subsequent Event [Member]      
Commitments and Contingencies [Line Items]      
Favorable arbitration award $ 50.0